How do I create an array of one column and several lines with only a few characters from the name of my files?

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pink flower
pink flower 2020-8-25
编辑： Jan 2020-8-31
I have several files with this structure. At each loop, a file is opened and I would like to write the first 5 characters of the file name in a column. How can I do this?
Example:
03000_20200506_0300.dat
04000_20200506_0300.dat
05000_20200506_0300.dat
06000_20200506_0300.dat
The matrix I would like to obtain:
03000
04000
05000
06000
...
Thanks.

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KSSV
KSSV 2020-8-25
编辑：KSSV 2020-8-25
name = "03000_20200506_0300.dat";
s = strsplit(name,'_') ;
s{1}
Or
name = "03000_20200506_0300.dat";
name(1:5)
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